MJB Motorsport

Dyno Session #2

THE TESTING FACILITY:

The dyno testing comparison was carried out at Auto Motion of Louisville, Kentucky (502) 589-1155. The dyno operator, Bryan Rose, assisted in running the Mustang AWD Dynometer. Auto Motion is a full service maintenance, repair, and tuning facility with a separate dyno room consisting of two Mustang Dynometers.

See: www.automotionky.com for more information about the facility.

THE PLAYERS:

Audi Performance and Racing (APR) - The APR programming was distributed via high speed internet connection from APR headquarters in Auburn, Alabama (800) 680-7921. According to news archives, APR has been tuning cars as a team since 1997 and today employs over 25 employees. Stephen Hooks is the current president of APR and has spent time as the crew chief for the IAMG/APR Team Motorola Cup S4. Brett Augsburger the Vice President at APR has a degree in mechanical engineering. Ben van Leeuwaarde works as the general director of APR owned Oettinger Performance GmbH located in central Germany. Keith Lucas serves as one of the retail sales consultants.

See: www.goapr.com for information about the products.

Milltek Sport - Milltek Sport is an exhaust design and manufacturing company that is based in the UK. They have been building exhaust systems for over 20 years for automobile manufacturers including Audi, Volkswagen, Porsche, Mini and BMW. They currently have distributors in over 40 countries thoughout the world. The Milltek exhaust that was used on this 2004 Audi S4 was purchased at Stratmosphere, an authrorized Milltek distributor (866)533-1777. Stratmosphere also supplied the Hyperflow induction kit.

See: www.stratmosphere.com and www.millteksport.com


THE PROCEDURES:

1. The vehicle was dyno tested January 15th, 2007.

2. During two weeks prior, the vehcle had installed the ECU flash programmed with APR Stock/91/93 octane "special" programs. A product tester was present for the flashing of the computer.

3. The vehicle was run on the dyno for three third gear dyno pulls from 2500rpm to redline while in stock program mode.

4. The vehicle was stopped on the dyno and the chip program was set to 93 octane APR chip mode. The ignition was cycled twice and the vehicle was driven approximately 5 miles on the dyno in street simulation mode to attempt adaptation back to stock values.

5. The vehicle was run again on the dyno for three third gear dyno pulls from 2500rpm to redline while in APR 93 octane program mode.


THE DYNO CONDITIONS:

Vehicle:

The test vehicle is a 2004 Audi S4 6-speed. Installed on the vehicle was an APR tuned ECU, APR downpipes with 200cpsi metallic high flow catalytic converters, Milltek non-resonated catback exhaust, and Hyperflow induction kit. Also installed on the vehicle was the Bilstein PSS9 coilover system and OZ Ultraleggera 18x8" ET35 wheels with Hankook K104 245/40/18 tires. These components remained on the vehicle throughout the entirety of the two groups of dyno testing. Air pressure in the tires was checked and held constant prior to each dyno day.

The fuel used for each dyno session was Shell 93 Octane V-Power fuel obtained from Lexington Shell on the corner of Sarno Road and Man O'War in Lexington, Kentucky. The vehicle was dyno tested with approximately 7 gallons of fuel in the prior to the session.

The Dyno:

The vehicle was tested on the Mustang AWD Dynometer at Auto Motion during this session. Prior to the session, the current ambient conditions were measured and entered into the dyno computer. SAE correction methods were held constant.

The car was placed on the dyno and strapped down using the same number of straps and same strap locations as each dyno session will use. The single "Tornado Baby" fan was used during the dyno session. The fan was placed in front of the radiator of the vehicle. The hood remained closed during testing.

The vehicle was driven approximately 80 miles to the dyno testing facility for this dyno session. It was then allowed to cool for approximately 90 minutes. It ran in two dyno groups. The two dyno groups were also seperated by a 90 minute cool down. During each group of this session the vehicle was dyno tested initially in third gear, rested for 2-5 minutes, dyno tested in third gear, rested for 2-5 minutes, and dyno tested again in third gear. The dyno logs for each fisrt run were recorded and compared in an attempt represent real world conditions of the car's performance on the road rather than one shot suicide dyno runs.

THE RESULTS:

Run Group 1: ECU in Stock mode with the Hyperflow induction kit, APR downpipes, and Milltek non-resonated catback exhaust.

Run Group 2: ECU in APR 93 octane mode with the Hyperflow induction kit, APR downpipes, and Milltek non-resonated catback exhaust.

Comparison: The following dyno logs represent a comparison of initial dyno runs from Group 1 (stock ECU mode) and Group 2 (APR 93 chip mode).

THE SUMMARY:

With regards to horsepower, the APR program evidenced significant gains higher up in the rev band with peak horsepower now made at 7250rpm, higher than has been seen at any of the dyno days with this particular vehicle.

With regards to torque, the APR programmed ECU consistently evidenced an increase in torque. During testing of the previous software the increase in torque looked like a small gradual "hump" on the dyno graph from 3800rpm to 4400rpm as compared to the stock mode. However, this new program evidences linear torque gains throughout the entirety of the low and midrange revband.

Again, important to mention is that each of the components installed on the Audi S4 has continued to perform flawlessly both on the dyno and on the streets.

As always, thank you to the folks at Auto Motion, APR, Milltek, and Stratmosphere.